<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="lib/react.js"></script>
    <script src="lib/react-dom.js"></script>
    <script src="lib/browser.js"></script>
</head>
<body>
    

    <div  id="root"></div>

    <script  type="text/babel">

        class  App extends React.Component{

            constructor(props){
                super(props)
                
                this.state = {
                    msg : ""
                }

            }


            change(e){
                let val = e.target.value;

                this.setState({
                    msg:val
                })
            }

            render(){

                return(<div>
                    
                    <h1>{this.state.msg}</h1>
                    <textarea   onChange={this.change.bind(this)}></textarea>
                
                </div>)
            }

        }
        //jsx     javascript + xml  
        ReactDOM.render(<App/>,document.getElementById("root"))

    </script>
</body>
</html>